CONTENTS

 1     Scope
 2     References
 3     Terms and definitions
        3.1     Definitions
        3.2     Terms defined in other Recommendations
        3.3     Terms defined in other standards
 4     Abbreviations
 5     General considerations
        5.1     Safety considerations for avoiding damage to the human eye and skin
        5.2     Considerations to keep fibres damage-free
 6     Procedures and guidelines
        6.1     General
        6.2     APR procedures for systems employing discrete optical amplification
        6.3     APR procedures for systems based upon distributed Raman amplification
Appendix I – Examples of APR architectures for systems (including those based upon Raman amplification) deploying an OAC
        I.1        Considerations on using an OAC instead of a restart pulse for automatic restart
        I.2        Description of APR procedure using co-propagating OSC
        I.3        Description of APR procedure using counter-propagating OSC
Appendix II – Description of ALS/APSD procedures for single-channel point-to-point SDH systems
       II.1     Introduction
       II.2     Single-channel point-to-point SDH without line amplifiers
       II.3     Single-channel point-to-point SDH with line amplifiers